Is Your Cadillac, GMC, or Buick Running Rough?
If your 2008-2009 Cadillac CTS, Acadia, or other compatible GM vehicle is experiencing frustrating issues like a persistent check engine light, stalling, poor fuel mileage, or a no-start condition, a failing Engine Control Module (ECM) is often the culprit. The ECM is the brain of your vehicle’s engine, controlling everything from fuel injection and ignition timing to emissions systems and transmission shifting. When it fails, it can cause a wide range of problems that can leave you stranded. Don’t let a faulty computer dictate your vehicle’s reliability. This direct-replacement ECM is the solution to restore your engine’s peak performance and dependability.
From the Diagnostic Bay
We had a 2009 Cadillac STS come into the shop with a ghost of a problem. The owner complained of random stalling at stoplights, but with no consistent check engine codes. We checked fuel pressure, sensors, and wiring harnesses, but everything seemed fine. On a hunch, we monitored the live data stream from the ECM and noticed the injector pulse width would occasionally drop to zero for a split second, killing the engine. After swapping in a known-good module, the problem vanished. The original ECM had an internal fault that only showed up under specific conditions. This is a classic example of how a failing computer can cause baffling issues that a simple component swap can fix instantly.
Symptoms of a Failing Engine Control Module
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Engine stalling, stumbling, or misfiring unexpectedly.
- ✔ Difficulty starting the engine or a complete no-start condition.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Loss of power and poor acceleration.
- ✔ Communication error codes with diagnostic scan tools.
Why Choose Our Pre-Programmed 2008-2009 CTS ECM?
This isn’t just a replacement part; it’s a complete, ready-to-install solution. The biggest hurdle in replacing a modern ECM is the need for expensive, dealer-specific programming. We eliminate that step entirely. When you purchase this module, you simply provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then flash the unit with the latest, most stable software updates directly from General Motors, ensuring it is perfectly matched to your vehicle’s specific configuration. This plug-and-play approach saves you time, money, and the headache of towing your car to a dealership for programming.
Simple Process, Lasting Solution
- ✔ Place Your Order: Add this module to your cart and complete the checkout process.
- ✔ Provide Your VIN: Reply to your order confirmation email with your vehicle’s VIN or enter it during checkout.
- ✔ We Program It: Our experts flash the module with your vehicle’s specific software.
- ✔ Install and Drive: Once you receive the part, simply install it. In most cases, you’re ready to go. Some vehicles may require a simple security relearn procedure, which can often be done without special tools.
Broad Compatibility
This module is a direct replacement for several part numbers and fits a range of GM vehicles. Please verify your part number or vehicle fitment below.
Replaces Part Numbers: 12623325, 12628387, 12605672, 12630594, 19300016
Fits The Following Vehicles:
- 2008-2009 Cadillac CTS (3.6L, VIN V)
- 2008-2009 Cadillac STS (3.6L)
- 2009 GMC Acadia
- 2009 Chevrolet Traverse
- 2009 Saturn Outlook
- 2009 Buick Enclave
Frequently Asked Questions
Do I need to have this ECM programmed by a dealer?
No. We handle all the programming for you before we ship the part. Simply provide us with your vehicle’s VIN, and it will arrive ready for installation.
Where can I find my VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Is any other procedure required after I install it?
In many cases, the vehicle will start and run perfectly after installation. However, some GM vehicles may require a security relearn procedure (also known as a key relearn or anti-theft relearn) to sync the new ECM with your keys. This procedure can typically be performed without any special tools and instructions are widely available online.
How can I be sure my old ECM is the problem?
While the symptoms listed are strong indicators of a failing ECM, it’s always best to have a qualified mechanic perform a full vehicle diagnostic. Issues with wiring, sensors, or fuel delivery can sometimes mimic ECM failure. Proper diagnosis ensures you are replacing the correct part.
Will this module fix my check engine light?
If the check engine light is caused by an internal fault within your old ECM, then yes, this replacement module will resolve the issue. If the light is on due to another failing component (like an oxygen sensor or catalytic converter), that component will still need to be addressed.